[DeTomaso] BBORR report

[JDeRyke at aol.com]

In a message dated 4/27/09 9:21:11 AM, asajay at asajay.com writes:

> Oil -in- the bellhousing?  I'm guessing a rear main seal.  Consider 
> this... if the detonation was bad enough, it may have blown a hole in a piston 
> top.  Now, all that pressure is going into the crankcase, and the bottom end 
> at that.  So my guess is one hole in one piston, and a blown rear main 
> seal.  But that's just guess.
> 
Agreed, except the rear main may still be OK. A blown or cracked piston or 
top ring will pressurize the crankcase and combustion pressures can't escape 
thru the rocker breather or PCV fast enough. I wouldn't be surprised to 
find fresh oil on the inside firewall, too. That would have gone by the front 
main seal. But a simple compression check or a Monoxide sniffer in the 
radiator cap opening will tell you if there's metal missing in one bore. In any 
case, your Spring Project will be an overhaul- or at least a partial tear-down 
to locate the source of the popping. How old is the harmonic balancer? If 
the outer ring of your balancer rotated, you could have radically advanced 
the timing trying to get back to a non-true Top Dead Center mark. And I STILL 
find people that haven't changed the fragile spring-pin holding the 
distributor drive gear onto distributors- either stock or aftermarket! Those pins 
sometimes only partlally shear, allowing the gear to twist on the shaft and 
changing ignition timing. Good luck- J Deryke



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